After the composite product has been cured at a certain temperature and time, the interlayer peeling composite film adhesive layer still has a certain viscosity, that is, after the composite film peeling, the two-layer film will be re-glued together by hand, and the severe drying of the composite film adhesive layer will directly affect the peeling strength of the composite film, while the slight non drying phenomenon will lead to poor heat sealing strength after bagging, and the viscosity after the interlayer peeling. Heat sealing place is easy to wrinkle phenomenon, but storage a week or half a month later, packaging bag wrinkle phenomenon, this phenomenon, caused by the loss is often larger. Causes of non -drying composite film 1.The ratio provided by the glue manufacturer is not accurate, the proportion of curing agent is too small or the ratio of mixing glue liquid is misadjusted, and the curing agent is too little or ineffective. 2.In addition to dilute the solvent water or small molecular alcohol content is too high consumption of curing agent 3.Film moisture absorption, especially NY and cellophane, it is easy to appear not dry phenomenon. 4.The use of ink containing alcohol solvent does not volatilize completely resulting in the glue layer is not dry. 5.The use of polyurethane, polyester ink without hardening agent caused by the glue layer is not dry phenomenon. 6.The ambient temperature and humidity are too high, the prepared adhesive is placed for too long, resulting in the curing agent and water reaction for a long time. 7.Containing K coating PET film composite machine PET film additive influence. Corresponding solution 1.Generally speaking, the ratio provided by adhesive manufacturers is a reasonable ratio obtained through a large number of tests by adhesive manufacturers. Therefore, the ratio will not be inaccurate. If indeed because of the quality of the adhesive itself must be replaced by the adhesive; 2.Reduce the total content of water and alcohol in ethyl acetate (replace good quality ethyl acetate, the total content of water and alcohol is less than 0.2%); 3.When the composite moisture absorption NY and cellophane film adjust to improve the proportion of curing agent (5% ~ 10%), at the same time do not use damp film; 4.As far as possible to reduce the amount of residual solvent in printing ink; 5.The use of polyurethane ink: the first is to solve the composition of polyurethane ink dilution solvent, try to do not use alcohol dilution solvent. If alcohol diluent must be used when printing, it should also be done in printing to minimize the residual solvent; Secondly, if there is a printing film with white ink, finally, a small amount of hardener is added to white ink, which can increase the compound fastness. But added hardener ink use period is shorter, if there is surplus, and the interval time is longer in principle should not be used again. Finally, the purity of ethyl acetate used for preparing adhesive dilution should be...

Self-adhesive labels are ubiquitous in our daily life, and are necessary consumables for many manufacturers. However, the warping Angle of self-adhesive labels has been troubling many manufacturers. A small warping Angle will directly affect the beauty of the products, leading to their own products are not favored from the visual point of view. So, why will self-adhesive warping Angle? How to deal with this kind of Angle problem, here involves a lot of professional problems. The following Xiaobian to explain to you one by one. 1.When sticking self-adhesive labels on the automatic labeling machine, many manufacturers find that the warping Angle often appears, which is the initial viscosity problem, and the instantaneous adhesion is not strong. That is to say, when the roller of the automatic labeling machine presses the label on the bottle, the time is too fast, the pressure time between the label rubber surface and the bottle contact surface is not long enough, resulting in the label cannot be well adhered to the bottle, and it is easy to warpage. This is the case that the initial adhesion of the self-adhesive label is not strong. 2.Many people find that self-adhesive labels will fall off and lose viscosity after a short time. This situation is the problem of holding viscosity, is the retention of the poor. In other words, the durability of label glue is too poor. After reaching a certain period, the glue loses viscosity, has no adhesion and falls off naturally. It's the durability of the glue. The following is the specific treatment method of self-adhesive warping Angle: 1.The pressure of the press wheel of the labeling machine is not enough: adjust the press wheel of the labeling machine and check the machine failure. 2.glue viscosity is too weak: should choose the appropriate glue material; 3.Improper selection of adhesive: When selecting self-adhesive, first of all, we should determine whether the adhesive required by the self-adhesive label is permanent or detachable, whether it can be pasted once or re-pasted, and whether there are special requirements for the chemical characteristics of the adhesive for the self-adhesive label. For example, when labeling large curved surfaces (circular substrates less than 2 cm in diameter), instead of using thick or hard paper materials (such as mirror coated paper) as surface materials, thin or soft paper materials and adhesives with high initial viscosity should be used; For containers requiring hot filling, film materials and adhesives with good initial viscosity should be selected as the surface material of self-adhesive materials. 4, the coating tension control is not good: the correct label of the coating is smooth after being removed from the base paper, without curling. After labeling, the label can keep good follow-up; When the label with too tight film tension is removed from the base paper, the label will turn up, leading to the phenomenon that the edge of the label is easy to degummed, and the...

Adhesive label is a representative pressure sensitive adhesive product which coexists with adhesive tape for packaging. Its wide range of uses, such as: food, cosmetics, drugs and other use of senior beautiful label; Quality marking labels for fiber products, electronic machines, daily necessities, etc.; A price tag used in a supermarket or grocery store; Computer tags for schools, hospitals and offices; Industrial labels used in engineering management. It is widely used in all industries and fields. Its growth rate is increasing by about 15% a year. The substrates used are paper, polypropylene film, polyester film, PVC film, aluminum foil, fiber and so on. Pressure sensitive adhesive is divided into acrylic, rubber, hot melt and so on. Europe, the United States mostly used rubber system, and recently quickly transferred to the hot melt system. According to a person of insight, 80% of the future adhesive label to hot melt system. In Japan, it's almost always acrylic. Acrylic pressure sensitive adhesive, has outstanding weather resistance, but also has good cutting, this is the reason to occupy the market. In Japan, the sealing packaging machine is very common, so the requirements of label cutting quality, operation suitability is very strict. Paper adhesive labels almost all use acrylic emulsion pressure sensitive adhesive; Film adhesive labels use acrylic solvent pressure sensitive adhesive. Adhesive labels are roughly divided into permanent adhesion type, then peel type, frozen type. Permanent adhesive type is used on items that do not need to be uncovered once attached. Its physical properties require fast viscosity, adhesion, and cohesion can be lower. Repeel type must be attached once on the article, clean without leaving residue. So the requirement of its fast viscosity is good, but the adhesion force is low, and the cohesion requirements are high. The frozen type requires good low temperature characteristics due to the popularity of frozen food. They are more commonly manufactured by coating the isolation paper with pressure-sensitive adhesive, drying it and then recombining it with the substrate, and finally rolling it into the product.

Water based adhesive for a more sustainable bond The market share of water-based adhesives is becoming increasingly large as development has shifted towards increasingly sustainable solutions that support health and safety and reduce environmental impact.Water-based adhesives are an excellent alternative to solvent-based systems because they do not contain any volatile organic compounds (VOC), are lighter, and generally require less product to form a lasting bond. Compared to other solutions, water-based adhesive systems are environmentally friendly, have low VOC content and are more user friendly.Using water-based adhesives does not require as many safety measures as systems that include solvents, which can increase efficiency depending on the nature of the project. In addition, the finished product is user friendly: Water-based adhesives do not pose a great health risk, nor do they release toxic or odorous fumes. Compared to other solutions, water-based adhesive systems are environmentally friendly, have low VOC content and are more user friendly. Using water-based adhesives does not require as many safety measures as systems that include solvents, which can increase efficiency depending on the nature of the project.In addition, the finished product is user friendly: Water-based adhesives do not pose a great health risk, nor do they release toxic or odorous fumes. Types of water-based adhesive systems The trend in adhesives is strong water based. In Europe and the US, water-based adhesives are the system of choice, while in markets such as China, they account for only about 20 per cent of the market. Water-based glue systems can be roughly divided into two categories: emulsion and disperse adhesives and solution adhesives. Class I: aqueous adhesive Solution adhesive is the most traditional form of water-based adhesive system. They use water as a carrier substance and solidify as the water evaporates. These water-based adhesives are made using natural and synthetic polymers that dissolve in water. Uses for these water-based glue systems include paper adhesives and wettable glues, such as those found in envelopes, stamps and labels. Application: Roller, spray and bead Adhesion: Wet adhesion Examples: Starch/dextrin adhesives for paper applications such as book binding, and protein/casein adhesives for the food packaging industry. Type 2: Water-based lotions and dispersing adhesives Water-based adhesives are used primarily for food packaging lamination, but are also finding an increasing share in other applications. Water-based adhesive emulsion and dispersion system is a heterogeneous mixture consisting of liquid or solid polymer phases dispersed in the water phase. These water-based adhesives can be made using a variety of polymers, including PVA (vinyl acetate polymer), PVAC (vinyl acetate copolymer) and acrylic, as well as synthetic elastomers such as PUR (polyurethane). Like other water-based adhesives, disperse adhesives and lotions can also...